A basic physics demo of a ball launcher, with differing variables you can play with; - Tower Height - Launch Velocity - Launch Angle There are also different gravities you can mess with. There is a basic 5 pin system for each time the ball lands. You can click on any of the colored pins to remove them. The white pin indicates where the ball lands at the default settings. The reset symbol in the middle (surprisingly) resets all of the sliders to default and clears the pins.